Cu 70, Ni 30 (wt%), cored dendrites
This alloy is typical of many copper based alloy systems. The dendrite structure shows coring (variation in solute concentration). The light areas are rich in nickel and the darker areas are low in nickel. Chill casting extracts heat quickly enough to prevent significant solid state diffusion, resulting in cored dendrites. The centres of the dendrites that cool near the liquidus temperature, are nickel rich compared to the outer layers that solidify at progressively lower temperatures. Because t
Cu 85, Sn 15 (wt%) bronze, annealed
Subsequent to casting this sample was subject to an annealing treatment which served to recrystallise the sample. Evidence of this can be found in the annealing twins visible in several of the grains. These are a consequence of growth accidents during recrystallisation. Their shape is determined by the need to minimise interfacial energy. There is no strain energy associated with such twins and hence they do not have pointed ends.
Parabolic beach marks on a polystyrene fracture surface
The fracture surfaces are generally very sharp and angular, indicating fast, brittle fracture with little ductile tearing. Parabolic 'beach marks', can be seen where the fracture has grown at a speed comparable to the speed of sound in the material. This results in periodic, momentary arrests in the crack propagation and periodic ridges in the fracture surface as it advances. These indicate the direction in which the fracture has occurred. Inside the beach marks is a disc-shaped flat region wher
Beach marks on a polystyrene fracture surface
The fracture surfaces are generally very sharp and angular, indicating fast, brittle fracture with little ductile tearing. 'Beach marks', can be seen where the fracture has grown at a speed comparable to the speed of sound in the material. This results in periodic, momentary arrests in the crack propagation and periodic ridges in the fracture surface as it advances. There is also evidence of the fracture surface branching onto different planes as it progresses.
Fracture surface in polystyrene
The fracture surfaces are generally very sharp and angular, indicating fast, brittle fracture with little ductile tearing. Parabolic 'beach marks', can be seen where the fracture has grown at a speed comparable to the speed of sound in the material (and has thus been periodically arrested) and indicate the direction in which the fracture has occurred. In places, there is evidence of ductile tearing, and also a finely fibrous surface which is the remnant of crazes. There is also some evidence of
Tetragonal Zirconia Polycrystals (TZP)
The comparatively low sintering temperature allows very fine grained (sub-micron), dense and so high strength as well as tough ceramics to be produced. The microstructure shows equiaxed, fine grains with little evidence of weakening grain boundary phases. Such microstructures have some of the highest values of toughness achieved in ceramics.
Health promotion, health education and HIV/AIDS
This article will focus on the role that health promotion can play in preventing the transmission of HIV. The school setting is taken as an example and a range of effective methods and approaches focusing on young people are identified. It gives an outline of the nature of health promotion, followed by consideration of school-based efforts, which aim to protect the future generation, and a summary of some of the strategies that have been effective in this setting. Finally, issues related to heal
Archaeology of Medieval and Tudor Britain
The aim of this course is to provide a broad understanding of the archaeology of Britain in the period c. 1066-1600. Although the bulk of the material will relate to England and Wales, occasional reference will be made to Scotland and Ireland. The course takes a necessarily broad approach to the archaeology of the period. Although the treatment of excavated data will form an important component of the syllabus, other types of evidence will also be considered. For instance, the course will examin
Town and Country in Roman Britain
This course aims to look at the archaeology of various types of urban centres in the province of Britannia Roman Britain and the settlements in the rural areas around them. In particular we will examine the inter-dependence and possible relationships of towns and countryside. We cannot ignore the fact that Britain was only one small province of an Empire which stretched from Asia Minor to Scotland and the Sahara Desert to the rivers Rhine and Danube. We may therefore occasionally have to conside
Guide to Teaching Reading at the Primary School Level
This manual was developed to assist teachers in teaching reading at the primary school level. It is intended to help teachers create an educational vision for ensuring reading abilities and develop an educational philosophy based on this vision.
Ethnic Discrimination Curriculum
This lesson explores discrimination based on ethnicity. The lesson is in three sections, each framed by guiding questions such as: What is ethnicity? How is it different from nationality? What is my ethnic identity? What are some of the causes and impacts of ethnic discrimination? What is being done to address ethnic discrimination? What can I do?
ISKRA Market Research teachers notes
Title ISKRA Market Research Session - Market Research to determine viability of product idea Learning Outcomes - At the end of this session students will have had the opportunity to perform initial market research on a new product idea with a view to creating a business or social enterprise. Activity - Yes, group based open-ended problem Case Study - Yes, based on a true entrepreneurial experience Teachers Notes -Yes, word document Support Material - PowerPoint slides, Case study Suggested Prere
Sustainable Communities: Research in Action
This core module will enable you to develop a range of key geographical and transferable skills relating to project research and management. You will begin to understand what a professional geographer does through a consultancy based project which will involve interacting with a client (the University) to create real and useful research. This will help instil a sense of professionalism in your work and create high quality outputs. You will also develop an understanding of how businesses and comm
Using Portfolio's for Learning and Assessment - A staff handbook
This resource offers guidance for staff on introducing students to portfolios to be used for learning and assessment. It is based on experience gained while working on an FDTL Project “Promoting the Development of key skills through the use of portfolios” (2002 - 2005). The outlined Portfolio Workshops in this handbook have been developed as a result of the Project activities at Leeds Metropolitan University, but are also supported by the findings from the project as a whole. There are 2 acc
SCY-Science created by you: un environnement en ligne pour apprendre par l'investigation et la conce
Le projet SCY a pour objectif de mettre en place un environnement informatique novateur pour l'apprentissage des sciences par diverses démarches telles l'investigation, la conception, le jeu ou la collaboration. Le public visé est les élèves de collège et de lycée (12-18 ans). L'objectif de la communication est de présenter la mission 1 : "concevoir une maison qui émet peu de CO2" à l'aide de la plateforme SCY-Lab.
International Business in Darden's Global Executive MBA
http://www.darden.virginia.edu/web/GEMBA/ - Julien Menager (GEMBA Class of 2015) worked as a private banker for an international bank in Paris, France before starting his own business in consulting. In this video, he discusses the importance of understanding global business and how Darden's Global MBA for Executives helps him further develop his skills in working across continents and cultures. Learn more about Darden's Global MBA for Executives: http://www.darden.virginia.edu/web/GEMBA/
Solar Storms, Discovery Channel Series
This video is a combination of documentary and speculation concerning severe solar storrms. Suitable for high school students.
Prescribing Heroin: the logical next step for Canada?
October 30, 2013 - Panel Discussion Prescribing Heroin explores the questions: what would an ongoing prescription heroin program in Canada look like, and how can we get there? Five years after the NAOMI clinical trial, which confirmed worldwide research demonstrating the effectiveness of prescribing heroin for those chronically dependent drug users who have not responded to other forms of treatment, this health intervention is still not available anywhere in Canada. The panel discussion fol
Using the Keirsey Temperament Sorter to Determine Communication Styles
The Keirsey Temperament Sorter is found on a commercial site that categorizes individuals into four types of temperaments labeled Guardian, Idealist, Rational, and Artisan, each of which has four Characters, based on the Meyers-Briggs typology. These temperaments differ somewhat from the Communication Styles used in most Personal Selling textbooks (Amiable, Expressive, Analytical, and Driver). However, the Keirsey Temperament Sorter allows students to determine their own temperaments through a s